If you are looking to shoot past 500, the 20 MOA base is a good idea.
Both of the scopes are nice. If it was me, i would get the HS-T over the Mil Dot. Paired with a 20 MOA base, you will greatly increase your capability.
I know for a fact Mechanical Accuracy has built Howas.
20 MOA is the way to go (unless you are REALLY reaching out) ... I am not sure why they even make 0 MOA bases.
P.S. Vortex is nice to look ... just not through Why not buy Japanese or American glass for the same price, features and warranty?
Noted on the 20 MOA base, I think I'll be going with an EGW aluminum base and some unknown rings.
http://www.egwguns.com/index.php?p=product&id=1455
Suggestions for some sub $120 rings? One piece or two piece?
MoBoost, any suggestions on comparable American or Japanese glass in that sub $550 price point?